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Apples do not reproduce true to type, meaning that the tree from the seed will produce apples that are almost certain to be different than the parent.
There's a very good chance the apples won't even be edible.
Seeds from your dwarf apple tree will often produce full-sized trees. Many of these dwarf trees sold are created by grafting the variety onto a dwarfing rootstock. The variety itself may have the full-size genes, so that is what will come out when crossed.
Also, apple trees from seed take longer to produce fruit. It usually takes about 7 to 10 years before you can even tell if you are lucky and have good fruit. Once in a while, lucky finds are accidentally discovered among trees grown from seeds, that can be the fun in growing apples from seeds.
https://www.gardeningknowhow.com/edible/fruits/apples/saving-apple-seeds.htm